Seiko Cal. 5660 - 640

The Seiko 5660-640 represents an important milestone in Seiko's 1978 lineup. It features a White dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-b1dfdecb5d8e]

Also known as: Shogun, Flighty

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

15.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

40m

Dial Color

White

Jewels

26j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1978

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